Patent GB-1354142-A (GB)
Title: Grinding machine
IPC: B24B47/20
Filed: 1971-06-21
Abstract: 1354142 Grinding TOYODA KOKI K K 21 June 1971 [23 June 1970] 29067/71 Heading B3D [Also in Division: F2] A grinding machine, e.g. for crank-shafts W, comprises a work-supporting table 11 slidable on a bed 10, a grinding wheel carrier 14 movable transversely of the sliding of the table 11, table driving means, including means 15 for effecting fine adjustment of the table, and means 16 for locating the table 11 in a series of positions for grinding a series of portions of the workpiece W. The workpiece W is supported between a driven spindle head 13 and a tail stock 12 for action by a grinding wheel 17 supported on the carrier 14, and measuring means (84), Fig. 5 (not shown), is provided for generating a signal to indicate when the workpiece W has been moved to its first grinding position by movement of the table 11. For locating the table 11, an index pin 105 of the means 16 is engageable with one of a series of notches 20a corresponding to required grinding positions in an index plate 20 secured to the table 11, a main body 34 of the means 16 being adjustably positioned on a guide plate 24 bolted to the bed 10. For locating the body 34, a face 98a of a clamp bar 98 engages a member attached to the plate 24, an hydraulic piston 96 being actuable to effect clamping or release. For moving the table 11 between grinding positions, fast feed hydraulic means (82), Fig. 5 (not shown), and fine feed driving means 15 are provided, the latter comprising a gear 56 in mesh with a rack 107 of the table 11. The gear 56 may be driven through gears 52, 58, a further gear 51, engaging a rack formed on the rod 50 of an actuating piston (77), Fig. 4 (not shown), being slidably movable on a piston 48a to engage or disengage the gear 52 as one space or the other of a cylinder 51b formed in the gear 51 is pressurized. Complementary surfaces 51a, 52a of the gears 51, 52 thus act as a clutch for transmitting the feeding movement. A hand wheel 42 is also geared to the gear-wheel 58. At the start of a grinding operation, a sensor (83) of the measuring means (84), Fig. 5 (not shown), is engaged with the workpiece W and the index pin 105 is engaged with the first notch of the plate 20, the bar 98 being released. The table 11 and means 16 are then moved in unison until the sensor (83) indicates correct positioning, the bar 98 then being clamped while a grinding stroke is effected, with the clutch surfaces 51a, 52a disengaged. On withdrawal of the grinding wheel carrier 14, the pin 105 is released. The table 11 is then moved to the next grinding position, a limit switch 90 co-operable with dogs 91 on the carriage spaced in correspondance with the required grinding positions acting to cut off the drive, while engagement of the pin 105 with the next notch of the plate 20 positions the workpiece. The required portions of the workpiece W are thus ground in sequence, and the carriage 11 is then returned to its initial position for workpiece removal. In an alternative construction, Fig. 6 (not shown), the body 34 of the locating means 16 is movable by means of a screw connection to an hydraulically rotatable rod 60, supported in a device (75) attached to the base 10.